I assume your vocal track has an audio file you recorded on it - meaning it is not a Real Track. If that is the case there is little reason to move it to one of the 8 legacy tracks since the only thing you can do to it is mute or unmute using bar settings (F5). If you do want to mute and unmute at different places in the vocal audio track, best you use the Audio Editor.

Here is a quick and dirty trail to follow.

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